BRAVO! You got it right!

 The emissivity of the human body is about 0.95 and the surface area of an average male is about 1.75 m2. Normal body temperature is 37oC but skin temperatur is slightly lower, 35oC = 308 K.

At what rate does an average man radiate heat?

The rate at which heat is emitted is given by

Remit = e A Tobj4

Remit = (0.95)(5.67 x 10 - 8 W/m2 K4)(1.75 m2)(308 K)4

Remit = 848 W

(c) 2000, Doug Davis; all rights reserved.